path: root/src/util/wiki-data.js

// Utility functions for interacting with wiki data.

import {accumulateSum, empty} from './sugar.js';
import {sortByDate} from './sort.js';

// This is a duplicate binding of filterMultipleArrays that's included purely
// to leave wiki-data.js compatible with the release build of HSMusic.
// Sorry! This is really ridiculous!! If the next update after 10/25/2023 has
// released, this binding is no longer needed!
export {filterMultipleArrays} from './sugar.js';

// Generic value operations

export function getKebabCase(name) {
  return name
    .split(' ')
    .join('-')
    .replace(/&/g, 'and')
    .replace(/[^a-zA-Z0-9-]/g, '')
    .replace(/-{2,}/g, '-')
    .replace(/^-+|-+$/g, '')
    .toLowerCase();
}

// Specific data utilities

// Matches heading details from commentary data in roughly the formats:
//
//    <i>artistReference:</i> (annotation, date)
//    <i>artistReference|artistDisplayText:</i> (annotation, date)
//
// where capturing group "annotation" can be any text at all, except that the
// last entry (past a comma or the only content within parentheses), if parsed
// as a date, is the capturing group "date". "Parsing as a date" means matching
// one of these formats:
//
//   * "25 December 2019" - one or two number digits, followed by any text,
//     followed by four number digits
//   * "December 25, 2019" - one all-letters word, a space, one or two number
//     digits, a comma, and four number digits
//   * "12/25/2019" etc - three sets of one to four number digits, separated
//     by slashes or dashes (only valid orders are MM/DD/YYYY and YYYY/MM/DD)
//
// Note that the annotation and date are always wrapped by one opening and one
// closing parentheses. The whole heading does NOT need to match the entire
// line it occupies (though it does always start at the first position on that
// line), and if there is more than one closing parenthesis on the line, the
// annotation will always cut off only at the last parenthesis, or a comma
// preceding a date and then the last parenthesis. This is to ensure that
// parentheses can be part of the actual annotation content.
//
// Capturing group "artistReference" is all the characters between <i> and </i>
// (apart from the pipe and "artistDisplayText" text, if present), and is either
// the name of an artist or an "artist:directory"-style reference.
//
// This regular expression *doesn't* match bodies, which will need to be parsed
// out of the original string based on the indices matched using this.
//
const commentaryRegexRaw =
  String.raw`^<i>(?<artistReferences>.+?)(?:\|(?<artistDisplayText>.+))?:<\/i>(?: \((?<annotation>(?:.*?(?=,|\)[^)]*$))*?)(?:,? ?(?<date>[a-zA-Z]+ [0-9]{1,2}, [0-9]{4,4}|[0-9]{1,2} [^,]*[0-9]{4,4}|[0-9]{1,4}[-/][0-9]{1,4}[-/][0-9]{1,4}))?\))?`;
export const commentaryRegexCaseInsensitive =
  new RegExp(commentaryRegexRaw, 'gmi');
export const commentaryRegexCaseSensitive =
  new RegExp(commentaryRegexRaw, 'gm');
export const commentaryRegexCaseSensitiveOneShot =
  new RegExp(commentaryRegexRaw);

export function filterAlbumsByCommentary(albums) {
  return albums
    .filter((album) => [album, ...album.tracks].some((x) => x.commentary));
}

export function getAlbumCover(album, {to}) {
  // Some albums don't have art! This function returns null in that case.
  if (album.hasCoverArt) {
    return to('media.albumCover', album.directory, album.coverArtFileExtension);
  } else {
    return null;
  }
}

export function getAlbumListTag(album) {
  return album.hasTrackNumbers ? 'ol' : 'ul';
}

// This gets all the track o8jects defined in every al8um, and sorts them 8y
// date released. Generally, albumData will pro8a8ly already 8e sorted 8efore
// you pass it to this function, 8ut individual tracks can have their own
// original release d8, distinct from the al8um's d8. I allowed that 8ecause
// in Homestuck, the first four Vol.'s were com8ined into one al8um really
// early in the history of the 8andcamp, and I still want to use that as the
// al8um listing (not the original four al8um listings), 8ut if I only did
// that, all the tracks would 8e sorted as though they were released at the
// same time as the compilation al8um - i.e, after some other al8ums (including
// Vol.'s 5 and 6!) were released. That would mess with chronological listings
// including tracks from multiple al8ums, like artist pages. So, to fix that,
// I gave tracks an Original Date field, defaulting to the release date of the
// al8um if not specified. Pretty reasona8le, I think! Oh, and this feature can
// 8e used for other projects too, like if you wanted to have an al8um listing
// compiling a 8unch of songs with radically different & interspersed release
// d8s, 8ut still keep the al8um listing in a specific order, since that isn't
// sorted 8y date.
export function getAllTracks(albumData) {
  return sortByDate(albumData.flatMap((album) => album.tracks));
}

export function getArtistNumContributions(artist) {
  return (
    (artist.tracksAsAny?.length ?? 0) +
    (artist.albumsAsCoverArtist?.length ?? 0) +
    (artist.flashesAsContributor?.length ?? 0)
  );
}

export function getFlashCover(flash, {to}) {
  return to('media.flashArt', flash.directory, flash.coverArtFileExtension);
}

export function getFlashLink(flash) {
  return `https://homestuck.com/story/${flash.page}`;
}

export function getTotalDuration(tracks, {
  originalReleasesOnly = false,
} = {}) {
  if (originalReleasesOnly) {
    tracks = tracks.filter(t => !t.originalReleaseTrack);
  }

  return accumulateSum(tracks, track => track.duration);
}

export function getTrackCover(track, {to}) {
  // Some albums don't have any track art at all, and in those, every track
  // just inherits the album's own cover art. Note that since cover art isn't
  // guaranteed on albums either, it's possible that this function returns
  // null!
  if (!track.hasUniqueCoverArt) {
    return getAlbumCover(track.album, {to});
  } else {
    return to('media.trackCover', track.album.directory, track.directory, track.coverArtFileExtension);
  }
}

export function getArtistAvatar(artist, {to}) {
  return to('media.artistAvatar', artist.directory, artist.avatarFileExtension);
}

// Big-ass homepage row functions

export function getNewAdditions(numAlbums, {albumData}) {
  const sortedAlbums = albumData
    .filter((album) => album.isListedOnHomepage)
    .sort((a, b) => {
      if (a.dateAddedToWiki > b.dateAddedToWiki) return -1;
      if (a.dateAddedToWiki < b.dateAddedToWiki) return 1;
      if (a.date > b.date) return -1;
      if (a.date < b.date) return 1;
      return 0;
    });

  // When multiple al8ums are added to the wiki at a time, we want to show
  // all of them 8efore pulling al8ums from the next (earlier) date. We also
  // want to show a diverse selection of al8ums - with limited space, we'd
  // rather not show only the latest al8ums, if those happen to all 8e
  // closely rel8ted!
  //
  // Specifically, we're concerned with avoiding too much overlap amongst
  // the primary (first/top-most) group. We do this 8y collecting every
  // primary group present amongst the al8ums for a given d8 into one
  // (ordered) array, initially sorted (inherently) 8y latest al8um from
  // the group. Then we cycle over the array, adding one al8um from each
  // group until all the al8ums from that release d8 have 8een added (or
  // we've met the total target num8er of al8ums). Once we've added all the
  // al8ums for a given group, it's struck from the array (so the groups
  // with the most additions on one d8 will have their oldest releases
  // collected more towards the end of the list).

  const albums = [];

  let i = 0;
  outerLoop: while (i < sortedAlbums.length) {
    // 8uild up a list of groups and their al8ums 8y order of decending
    // release, iter8ting until we're on a different d8. (We use a map for
    // indexing so we don't have to iter8te through the entire array each
    // time we access one of its entries. This is 8asically unnecessary
    // since this will never 8e an expensive enough task for that to
    // matter.... 8ut it's nicer code. BBBB) )
    const currentDate = sortedAlbums[i].dateAddedToWiki;
    const groupMap = new Map();
    const groupArray = [];
    for (let album; (album = sortedAlbums[i]) && +album.dateAddedToWiki === +currentDate; i++) {
      const primaryGroup = album.groups[0];
      if (groupMap.has(primaryGroup)) {
        groupMap.get(primaryGroup).push(album);
      } else {
        const entry = [album];
        groupMap.set(primaryGroup, entry);
        groupArray.push(entry);
      }
    }

    // Then cycle over that sorted array, adding one al8um from each to
    // the main array until we've run out or have met the target num8er
    // of al8ums.
    while (!empty(groupArray)) {
      let j = 0;
      while (j < groupArray.length) {
        const entry = groupArray[j];
        const album = entry.shift();
        albums.push(album);

        // This is the only time we ever add anything to the main al8um
        // list, so it's also the only place we need to check if we've
        // met the target length.
        if (albums.length === numAlbums) {
          // If we've met it, 8r8k out of the outer loop - we're done
          // here!
          break outerLoop;
        }

        if (empty(entry)) {
          groupArray.splice(j, 1);
        } else {
          j++;
        }
      }
    }
  }

  return albums;
}

export function getNewReleases(numReleases, {albumData}) {
  return albumData
    .filter((album) => album.isListedOnHomepage)
    .reverse()
    .slice(0, numReleases);
}

// Carousel layout and utilities

// Layout constants:
//
// Carousels support fitting 4-18 items, with a few "dead" zones to watch out
// for, namely when a multiple of 6, 5, or 4 columns would drop the last tiles.
//
// Carousels are limited to 1-3 rows and 4-6 columns.
// Lower edge case: 1-3 items are treated as 4 items (with blank space).
// Upper edge case: all items past 18 are dropped (treated as 18 items).
//
// This is all done through JS instead of CSS because it's just... ANNOYING...
// to write a mapping like this in CSS lol.
const carouselLayoutMap = [
  // 0-3
  null, null, null, null,

  // 4-6
  {rows: 1, columns: 4}, //  4: 1x4, drop 0
  {rows: 1, columns: 5}, //  5: 1x5, drop 0
  {rows: 1, columns: 6}, //  6: 1x6, drop 0

  // 7-12
  {rows: 1, columns: 6}, //  7: 1x6, drop 1
  {rows: 2, columns: 4}, //  8: 2x4, drop 0
  {rows: 2, columns: 4}, //  9: 2x4, drop 1
  {rows: 2, columns: 5}, // 10: 2x5, drop 0
  {rows: 2, columns: 5}, // 11: 2x5, drop 1
  {rows: 2, columns: 6}, // 12: 2x6, drop 0

  // 13-18
  {rows: 2, columns: 6}, // 13: 2x6, drop 1
  {rows: 2, columns: 6}, // 14: 2x6, drop 2
  {rows: 3, columns: 5}, // 15: 3x5, drop 0
  {rows: 3, columns: 5}, // 16: 3x5, drop 1
  {rows: 3, columns: 5}, // 17: 3x5, drop 2
  {rows: 3, columns: 6}, // 18: 3x6, drop 0
];

const minCarouselLayoutItems = carouselLayoutMap.findIndex(x => x !== null);
const maxCarouselLayoutItems = carouselLayoutMap.length - 1;
const shortestCarouselLayout = carouselLayoutMap[minCarouselLayoutItems];
const longestCarouselLayout = carouselLayoutMap[maxCarouselLayoutItems];

export function getCarouselLayoutForNumberOfItems(numItems) {
  return (
    numItems < minCarouselLayoutItems ? shortestCarouselLayout :
    numItems > maxCarouselLayoutItems ? longestCarouselLayout :
    carouselLayoutMap[numItems]);
}

export function filterItemsForCarousel(items) {
  if (empty(items)) {
    return [];
  }

  return items
    .filter(item => item.hasCoverArt)
    .filter(item => item.artTags.every(tag => !tag.isContentWarning))
    .slice(0, maxCarouselLayoutItems + 1);
}

// Ridiculous caching support nonsense

export class TupleMap {
  static maxNestedTupleLength = 25;

  #store = [undefined, null, null, null];

  #lifetime(value) {
    if (Array.isArray(value) && value.length <= TupleMap.maxNestedTupleLength) {
      return 'tuple';
    } else if (
      typeof value === 'object' && value !== null ||
      typeof value === 'function'
    ) {
      return 'weak';
    } else {
      return 'strong';
    }
  }

  #getSubstoreShallow(value, store) {
    const lifetime = this.#lifetime(value);
    const mapIndex = {weak: 1, strong: 2, tuple: 3}[lifetime];

    let map = store[mapIndex];
    if (map === null) {
      map = store[mapIndex] =
        (lifetime === 'weak' ? new WeakMap()
       : lifetime === 'strong' ? new Map()
       : lifetime === 'tuple' ? new TupleMap()
       : null);
    }

    if (map.has(value)) {
      return map.get(value);
    } else {
      const substore = [undefined, null, null, null];
      map.set(value, substore);
      return substore;
    }
  }

  #getSubstoreDeep(tuple, store = this.#store) {
    if (tuple.length === 0) {
      return store;
    } else {
      const [first, ...rest] = tuple;
      return this.#getSubstoreDeep(rest, this.#getSubstoreShallow(first, store));
    }
  }

  get(tuple) {
    const store = this.#getSubstoreDeep(tuple);
    return store[0];
  }

  has(tuple) {
    const store = this.#getSubstoreDeep(tuple);
    return store[0] !== undefined;
  }

  set(tuple, value) {
    const store = this.#getSubstoreDeep(tuple);
    store[0] = value;
    return value;
  }
}